Fix the appdistro test app check for update button

[lfkellogg]

Right now it doesn't update the UI properly after getting the response back.

[google-oss-bot]

Coverage Report ¹

Affected Products

No changes between base commit (b600e83) and merge commit (708165d).

Test Logs

• Base (b600e83): https://android-ci.firebaseopensource.com/view/gcs/android-ci/logs/postsubmit-check-coverage/1518689924256108544
• Merge (708165d): https://android-ci.firebaseopensource.com/view/gcs/android-ci/pr-logs/pull/firebase_firebase-android-sdk/3680/check-coverage-changed/1519034694799200262

Notes

• Commit (708165d) is created by Prow via merging PR base commit (b600e83) and head commit (05f67e3).
• Run gradle <product>:checkCoverage to produce HTML coverage reports locally. After gradle commands finished, report files can be found under <product-build-dir>/reports/jacoco/.

1. https://storage.googleapis.com/firebase-sdk-metric-reports/OGKZ4Kh7VP.html

[google-oss-bot]

Size Report ¹

Affected Products

No changes between base commit (b600e83) and merge commit (708165d).

Test Logs

• Base (b600e83): https://android-ci.firebaseopensource.com/view/gcs/android-ci/logs/postsubmit-binary-size/1518689924260302849
• Merge (708165d): https://android-ci.firebaseopensource.com/view/gcs/android-ci/pr-logs/pull/firebase_firebase-android-sdk/3680/binary-size/1519034694799200263

Notes

• Commit (708165d) is created by Prow via merging PR base commit (b600e83) and head commit (05f67e3).

1. https://storage.googleapis.com/firebase-sdk-metric-reports/6zSFFnJMZB.html